| 摘要 |
In apparatus and method for treating granular product within a cylindrical chamber as the product, by the force of gravity, falls through a plurality of regions maintained at varying temperature and pressure. Structure formed by at least a pair of collectors is connected tangentially to a housing surrounding the regions to withdraw gas from and reintroduce gas to the cylindrical chamber. Particularly gas is withdrawn from a lower region, treated by heating and dilution with flue gases prior to reintroduction. Movement of gas is provided by a ventilator which serves to draw fresh air into the cylindrical chamber from the vicinity of the lower region. The flow of gas, the temperature of the gas, and the pressure within the regions result in granular product first moving counter to the flow of gas, then with the flow of gas, and then counter to the flow of gas. The granular product is heated, maintained at a heated temperature, and cooled within these flows.
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